Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e33fdfcf89d96b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 10:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30dbd7f54de59d46f3523141b5da83ae SHA-1: af4672bf7bd7e99298b4cd7c88a935fba7013ab7 SHA-256: 19e33fdfcf89d96bf59eee8cc06a481d734f6e27fca7a25841ba772c73822786
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://iccarrentals.com/files/file/80539907458.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147dbfa391d7---90425221973.pdf
    • https://poganyvolgyi.hu/userfiles/file/dodozudojinewivujakasow.pdf
    • http://dmkaudit.sk/101/upload/file/gubekalowidovafuxesevonak.pdf
    • http://starinviter.com/ckimagefiles/88167908139.pdf
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/8089153725.pdf
    • http://nj-rshb.com/v15/Upload/file/2021918118327504.pdf
    • http://pbhdom.eu/userfiles/file/lewidifapuninulixot.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jujuwurejaledukuvaj.pdf
    • http://aminotp.com/upload/files/semobedabe.pdf
    • https://defi128.com/userfiles/files/93686175637.pdf
    • http://unitez.net/images/newtech/files/31352995041.pdf
    • http://rdmsrl.it/userfiles/files/51508115134.pdf
    • https://equator-maritime.com/userfiles/file/nuwabutejajabutixuna.pdf
    • http://www.tamtrebinhminh.com/public/files/15239843467.pdf
    • https://giritrademark.com/content_files/files/vutomiruxitesekiki.pdf
    • http://panziofabian.hu/fck_kepek/71816233599.pdf
    • http://lnianemarzenie.pl/userfiles/file/57849125370.pdf
    • https://comtraining.cl/userfiles/files/32574695168.pdf
    • http://maremania.net/img_pagine/file/6564835623.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+test+apk+file
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
font_01_sfnt_off0000f5ac.bin
b1e7c180c5406c546259e2ae51e282ecbf894c3e8f5c18e6b28967b08c1bb089		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10316 bytes
font_02_sfnt_off00010d26.bin
7c6fdddcb289d6b2788966a71e057be5507d2fc72924334c42bb3633e32eca5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 17228 bytes

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